Die or tool holder.



"Patented Dec. 3, I901.

H. WHARTQN. DIE 0R TOOL HOLDER.

Application filqi Mar. 26, 1901.)

2 Sheets-Sheet I.

INVENTOR- his Azzamey (No Model.)

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WITNESSES: d/b

E94 y zz xJ" No. 687,804. Patented Dec. 3,1901.

I H. WHARTON.

DIE 0R TDUL HULDER.

(Application .filell Mar. 26, 1901.)

(No Model.) 2 Sheets8heet 2.

WITNESSES: W dz INVENTOR: 53/ ZZ Ztmrney I UNITED STATES PATENT FFlCE.

HARRY WHARTON, OF BIRMINGHAM, ENGLAND.

DIE OR TOOL HOLDER.

SPECIFICATION forming part of Letters Patent No. 687,804, dated December3, 1901.

Application filed March 26, 1901. filerial No. 52,893. (No model) usefulImprovement in Die or Tool Holders,

of which the following is a specification.

This invention relates to die-holders for screw-cutting machines and thelike, the primary object of the invention being to provide for the readyand instant disengagement at anytime of the cutters or chasers and thework or stock.

Another object is to secure that in cutting screws of difierentdiameters by one and the same die or set of dies, the work of cuttingshall not be done in some cases by one part or corner of the die and inother cases by some other part or corner of the die or dies, but shallbe done substantially by one and the same part in all cases.

Other objects willappear hereinafter.

To these ends the invention consists of features of construction,arrangements,and combinations of devices hereinafter described, and moreparticularly pointed out in the ap pended claims.

One form of the invention is illustrated in the accompanying drawings,forming part of this specification, in which Figure 1 is a front endview with the parts in normal or Working position. Fig. 2 is a plan viewof the same. Fig. 3 is aplan with some parts omitted and with the partsopened in the position in which the work and tool are wholly disengaged.Fig. 4. is a sectional transverse view on the planes indicated in Figs.3 and 6 by the line 4: at. Fig. 5 is a rear end view, the shank being insection on the plane indicated in Fig. 6 by the line 5 5. Fig. 6 is asectional longitudinal View on the horizontal planes indicated in Fig. 7by the line 6 6. Fig. 7 is a side elevation, partly in section; and Fig.8 shows end, side, and sectional views of a die. Fig. 9 shows a modifiedarrangement of a bearing.

Like reference-letters will be used to indicate the same part in thevarious views of the drawings.

a designates a metal shank by means of which the holder is connectedwith the toolcarriage of the machine. (Not shown.)

I) designates a head or block, preferably made from a solid piece ofmetal, which is mounted upon the shank Ct in such wise that it may havea limited motion axially of the shank and also a slight play relativelyto the shank in order that the head may accommodate itself to andcompensate for any slight inaccuracies which may occur in feeding thedies to the work, drc. Such axial motion is conveniently provided for byslots '0 in the head and pins d, fast to the shank and engaging With theslots 0. There are two such slots, one at each side, or, as the holderlies in the machine, at the top and bottom of the holder. The head I) isprovided with symmetrically-placed bores aparaliel with the shank a, forthe reception of helical springs f, which bear against screw-plugs 9,closing one end of said bores, and against arms h, which are secured byscrews to the shank a. and which extend over the other end of saidbores. i The springs g tend to move the head I) along the shank towardthe tool-carriage of the machine. (Not shown.) By preference the shankis hollow and the arms h are flush with the end thereof.

The front face of the head 17 has a horizontal transverse T-slot ttherein (or this may be a dovetail slot) for the reception, guidance,and retention of two die-carriersj, which are shaped to fit said slot 11and theface of the head I). At the sides of the head as it lies in themachine are longitudinally-extending slots 70, and the rear faces of theholders j are provided with slots Z opposite said slots is for thereception of one end of levers m,which lie in slots 7t and are fulcrumedupon the pins n, connecting them to the head I). The levers on may beprovided with antifriction-rollers 0, by means of which the leversengage the slots 70 and a cylindrical collar p on the shank,

or the collar 29 maybe replaced byother means connected together bysprings g, which hook over pins 7", fast to the levers, and draw thelevers toward the shank. The head I) is slotted transversely for thereception and protection of said springs q.

The die-carriersj are shown as having each two die guiding and holdingslots 3, in each of which is a die D. The slots 8 are rectangular incross-section and are open at their fronts and ends. The guides s are atright angles to each other and at an angle of forty-five degrees to theline of reciprocation of the diecarriers. Each die shown is fiat-sidedand is provided with a plurality of cutters, and the slots 3 areparallel with the axis of the shank, wherefore the cutters actsimultaneously on the stock or work. (Not shown.) Each die has a rabbet25 along one longer edge or corner, the rabbet of the dies carried byeach carrier being opposite each other, as shown in Fig. 1, whereby oneclamp M, on each carrier j may coact with the rabbeted portions of thedies to clamp and retain them in place in the slots 8. The clamps u arearranged to bear only at their outer ends against the carriers and uponthe rabbeted parts of the dies. As will be seen from Fig. 7, the clampsbear centrally of the slots 1), in which they are placed and by thewalls of which they are prevented from turning-th'at is to say, saidclamps hear each at three points only against the carrier and dies.Clamps u are held in place by screws to, which pass freely through theclamps and engage with threaded holes in the carriers j, the engagementbetween the screws and clamps being what is commonly called aball-and-socket connection.

The diesDare held against being forced endwise by the work by means ofscrews 00, which are provided with heads y of cylindro-conical form. Thecarriers j are provided with screwthreaded holes 2, with which screws a:engage, and said holes 2 have cylindrical countersinks at their outerends in which the cylindrical parts of the headsy fit accurately. Thedies D are provided with conical faces d which are adapted to bearagainst the coned portions of the heads y, and thereby to transmit thepressures through headsy to the carriersj without danger of breakingoreven bending the screws 00. By operating the screws w to move theheads 1 in or out the distance of the cutters of the dies D from theaxis of the shank may be decreased or increased. The dies are thusindependently adjustable with relation to the work or stock. Also thecarriersj are separated somewhat when in working position, and the headI) is centrally recessed and is also slotted vertically, as indicated inFigs. 1 and 2, the latter being a top or plan View. This separation andthese slots provide passages for oiling the work and for allowing thecuttings to fall away freely from the same. Itwill be noted that thedies D and clamps u extend beyond the face of the carriers, whence itfollows that threads may be cut on a screw or bolt close up to the headthereof, the ends of the dies and faces of the clamps'being flush witheach other, as shown in Fig. 2.

The operation of the above-described devices is as follows: With theparts in the positions shown in Figs. 1, 2, 5, 6, and 7 the dies D arein working or cutting position and the rollers 0 on the adjacent ends oflevers m bear upon the collar p, thus retaining levers m and carriersjinward of the head I) and transmitting the pressures upon the dies Dthrough the heads y, carriers j, and levers m to the collarp and shanka, which, with the slight play of the head on the shank above referredto, balances the forces. It is understood, of course, that the shank isfirmly connected with the tool-carriage of the machine and is therebymoved forward or toward the stock or work while the latter is rotated,as is usual in this class of machines, during which feed of the tool thecutting takes place. By stopping the advance of the tool-carriage at anypoint the cutters of the dies will by their engagement with the workdraw the head I) along the shank at until the rollers 0 pass the edge ofthe collarp, whereupon the springs g, which are heavier or stronger thanthe springs g, will cause the levers m to move quickly toward the shankuntil their rollers strike the same and arrest the levers and carriersas the latter move away from the work, but such arrest of the carriersdoes not take place until the dies D are moved wholly out of contactwith the work, so that the tool-carriage may be run back to itsstarting-point without the dies touching the work during such runningback. Anew stock may be inserted and the operation be begun over againafter the dies have been returned to working position. The carriersj maybe returned toward theaxis of the shank by suitable means as, forexample, the means shown in the drawings and now to be described. LeversA B are fulcrumed on pins at the upper side of the head and are providedwith bent ends for engagement with pins E on the carriers j. The leversA B are connected together by a slot and pin, as shown, so that theymove simultaneously and equally. By moving lever A from the positionthereof shown in Fig. 3 to the position thereof shown in Fig. 2 thecarriersj are forced inward or toward the axis of the shank, therebymoving the levers m away from the shank until the rollers 0 are clear ofthe collar 13, whereupon the springs g move the head I) along the shankand carry the rollers 0 over the collar p, as will be understood. Theshank being hollow and the dies movable, as described, it is obviousthat threads may be cut at any point upon a stock which may be passedthrough the shank for that purpose, being held, of course, as usual.

It is observed that each die D is movable along the slot 8 therefor in adirection that ICC is radial to the working part or cutter thereof,which adapts each die for use in cutting screws of different diameterswithout greatly varying the position of the working or cutting part ofthe die. In a known form of cutter there are two working parts situatedat about ninety degrees apart,said working parts being integral witheach other and being adjustable in a direction making equal angles withthe central radii of said cutters or working parts, whence it followsthat in using this old cutter or chaser to form screws of differentdiameters the work is sometimes done by one corner of the cutters andsometimes by the other corner. The last-mentioned difficulty, fordifficulty it is, does not occur in anything approaching the same degreewith my cutters, for these are moved radiallyor in directions parallelwith their central radii and not at an angle thereto.

It will be noted that there are very few parts that project beyond theoutline of the head I) in my tool-holder, most of the working partsbeing protected or housed against catching clothing or other objects.

Instead of the arrangement of the clamp 11..

shown in Fig. 7 the arrangement shown in Fig. 9 may be employed. In thisarrangement the face of the clamp is flat and not rounding and bearsupon a pin a of hardened steel, which sets or screws into a hole in thedie-carrier, the end of the pin being rounded OK, as shown.

While I have described the preferred form of my invention, I do notlimit myself to the precise form thereof shown in the drawings and abovedescribed, since the invention may be embodied in other forms orarrangements without departing from the spirit of my invention.

What I claim as new, and desire to secure by Letters Patent of theUnited States, is-

1. In a die or tool holder, the combination of a shank, ahead slidablealong said shank, die-carriers movable radially in guides on said head,spring-actuated levers for moving said carriers outwardly, and anabutment fixed on said shank and coacting with said levers to hold thedies in working position until the levers are released from the controlof said abutment by the. movement of the head along the shank, wherebythe levers quickly move the dies outof working position.

2.-In a die or tool holder, the combination of a shank, a head slidablealong said shank, die-carriers movable radially in guides on said head,spring-actuated levers for moving said carriers outwardly, an abutmentfixed on said shank and coacting with said levers to hold the dies inworking position until the levers are released from the control of theabutment by the movement of the head along the shank, whereby the leversquickly move the dies out of working position, and independent dies onsaid carriers and set at an angle to the direction of said radial oroutward motion.

3. In a die-holder for screw making machines, the combination of ashank, a head slidable therealong and spring-moved in one directionalong said shank, die-carriers slidable radially on said head to carrythe dies into and out of working position, springpressed leversfulcrumed on said head and operating said carriers, and locking meansfixed on said shank for causing said levers to hold said carriers innormal position, said locking means releasing said levers as said headis moved along said shank in one direction, substantially as described.

4. In a die-holder for screw-making machines, the combination of ashank, a head slidable therealong and spring-moved in one directionalong said shank, die-carriers slidable radially on the said head tocarry the dies into and out of working position, springpressed levers fulcru med on said head and operating said carriers, means fixed on saidshank for locking said levers and carriers in normal position with thedies in working position, and a lever system for returning said carriersto normal position, said locking means releasing said carrier-operatinglevers when the head is moved along said shank in one direction,substantially as described.

5. In a die or tool holder, the combination with a carrier, of a die ortool slidable inguides thereon, a cylindroconical stop for said die ortool, the axes of stop and die or tool forming other than a right anglewith each other, the end of said die or tool being adapted to bearagainst the coned stop and the cylindrical part of the stop alwaysbearing against the carrier, whereby the pressure upon the die or toolis always transmitted through the stop to the carrier, and meansindependent of said stop for retaining the die or tool in said guides,substantially as described.

6. In a die or tool holder, the combination with a carrier, of a dieortool slidable in guides thereon, a cylindroconical .stop for said dieor tool, the axes of stop and die or tool forming other than a rightangle with each other and the end of said die or tool being adapted tobear against the coned part of said stop and the cylindrical part ofsaid stop always bearing against the carrier, whereby the pressure uponthe die or tool is always transmitted through the stop to the carrier,and a screw for adjusting the position of said stop, the screw beingrelieved of transverse strain by said cylindro-stop.

7. In a die or tool holder, the combination with a carrier, of a die ortool slidable in guides thereon, an adjustable cylindroconical stop forsaid die or tool, the axes of die and stop forming other than a rightangle with each other and the end of the die or tool being adapted tobear against the coned part of said stop, and the cylindrical part ofsaid stop fitting in a cylindrical hole in the carrier and alwaysbearing thereagainst, whereby the pressure on said die or tool is alwaystrans mitted through the die and stop to the carrier, and means otherthan said stop for retaining the die or tool in said guides.

8. In a die-holder for screw-making ma chines, the combination of ashank, a head slidable therealong and spring-moved in one directionalong said shank, die-carriers slidable in guides across the front ofsaid head, levers of the first order working in slots in said head andoperating said carriers, springs connecting said levers and tensioned tocause them to move said carriers outward from normal position, and acollar fixed on said shank for locking said levers and carriers with thelatter in normal position, substantially as described.

9. In a die-holder for screw-making machines, the combination of ashank, a head slidable therealong and spring-held in normal positionrelatively thereto, die-carriers slidable in guides on said head tocarry the dies into and out of working position, carrier-opcratingspring-pressed levers fulcrumed on said head, and locking means fixed onsaid shank for causing said levers to hold said carriers in normalposition, said locking means releasing said levers when said head ismoved in one direction along said shank, substantially as described.

10. In a die or tool holder, the combination of a shank, a head movablealong said shank, die-carriers movable radially in guides on said head,spring-actuated levers engaging said carriers positively to move them,an abutment fixed on said shank and coact-ing with said levers to holdthe dies in working position until the levers are released from thecontrol of said abutment by the movement of the head along said shank,springs operating to move said head along the shank to a normalposition, and levers fulcrumed on said head and adapted to close saiddie-carriers and move their operating-levers to permit saidoperating-springs to return said head to normal position simultaneouslywith the return of the dies to working position.

11. In a die or tool holder, the combination of a shank, a head slidablealong said shank and having undercut guides across the front facethereof, die-carriers held by and movable along sa d guides, saidcarriers being recessed at their rear faces and said head having loneasecessesin said carriers, springs connected with said levers to cause themto move said car riers outwardly, and a collar or means fixed on saidshank and coacting with said levers to hold the dies in working positionand releasing the levers and dies as said head moves in one directionalong said shank.

12. In a die or tool holder, the combination with a shank, of a headslidable therealong and having guides across the front face thereof,die-carriers slidable along said guides and held against said front facethereby, said carriers being slotted on their rear faces and said headbeing provided with longitudinal slots therein, lovers of the firstorder fulcrumed on said head and lying in said longitudinal slotsthereof, springs for causing said levers to move the carriers outwardly,means fixed on said shank and coacting with said levers to hold the diesin working position and releasing the levers as the head slides alongthe shank in one direction, a lever system fulcrumed on said head andadapted to draw said carriers inward and their operating-levers back tonormal position, and springs for returning said head to normal position.

13. In a die or tool holder, the combination of a die-carrier, saidcarrier being provided with two converging die-receiving slots, dies inand movable along said slots, a clampingplate bearing upon each die andat one point only upon the die-carrier or a part connected therewith,and means for securing said plate in position.

14. In a die or tool holder, the combination of a die-carrier providedwith two converging slots, dies in and movable along said slots, acylindroconical stop for each of said dies or tools, said dies or toolsbearing against the coned part of said stops and the cylindrical partsof said stops always bearing against said carrier to transmit pressurethereto, a screw for adjusting the position of each of said stops, aclamping-plate bearing upon each die and at one point only upon thediecarrier or a part connected therewith, and means for securing saidplate in position, substantially as described.

Signed at New York city, in the county of New York and State of NewYork, this 23d day of March, A. D. 1901.

HARRY WHARTON.

WVitnesses:

Gus. O. HENNING, R. W. BARKLEY.

